
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

class DemoPage extends StatefulWidget {
  @override
  _DemoPageState createState() => _DemoPageState();
}

class _DemoPageState extends State<DemoPage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
       appBar: AppBar(
         title: Text("示例"),
         centerTitle: true,
       ),
      body: Container(
        color: Colors.red,
      ),
    );
  }
}
